This wikiHow teaches you how to clean-install Windows 8 on your PC, which means that Windows 8 will be the only operating system on your computer. The process for installing Windows 8 is slightly different than installing Windows 8.1, which is the most recent rendition of Windows 8.

Steps

Part 1

Preparing to Install

1

Buy an old version of Windows 8. The most recent version of Windows 8 is Windows 8.1, which is the only version of Windows 8 on the Microsoft Website. You can find versions of Windows 8 Pro on Amazon and in some tech stores.

If you already have a CD version of Windows 8, skip this step.

2

Back up your computer's files. Since you'll be replacing whatever operating system and files you currently have with Windows 8, make sure that you have a backup copy of everything that you want to keep before you proceed.

If you're using a USB CD drive, you may instead have to select "Removable Storage" (or similar) here. Make sure that you don't have any other USB items (e.g., a flash drive) plugged in if you do this.

8

Move the drive to the top of the boot list. With the "CD Drive" (or similar) option selected, press the + key until the selected option is at the top of the boot list.

If this doesn't work, check the key legend on the right side (or bottom) of the screen to see which key you should press to move the selected option.

9

Save and exit. For most BIOS pages, you'll press a key to do this; check the on-screen key legend to see which key you need to press. Once you've saved and exited, your computer should begin booting into Windows 8.

Part 2

Installing Windows 8

1

Select a language, time, and keyboard setting. In most cases, the information on this window should already be correct; if you see incorrect information (e.g., the wrong time/region), click the item's drop-down box and select the correct information in the drop-down menu.[1]

If you bought your Windows 8 CD back when Windows 8 came out, you may have a copy of the code in an email in your Microsoft-registered email account.

5

Check the "I accept" box. It's near the bottom of the window.

6

Click Accept. This option is in the bottom-right corner of the window.

You may instead click have to click Next here.

7

Click Custom Install Windows only. It's an option on the "Which Type of Installation do you Want" screen.

8

Click Drive options (advanced). You should see this option near the middle of the page.

9

Delete the existing information. In the window near the top of the page, click a drive name, then click Delete and confirm the decision if prompted. Repeat this process for all drives listed.

10

Click Unallocated space. This should be the only option in the window near the top of the page.

11

Click New. It's near the bottom of the page.

12

Click Apply, then click Next. Both buttons are at the bottom of the page. Doing so will confirm your installation location and begin installing Windows 8 onto your computer.

13

Wait for Windows 8 to finish installing. Your computer will restart multiple times during the installation process. Once Windows 8 is done installing, you should be at the login screen.

You may be prompted to do some personalization work (e.g., selecting a theme and color) before you can continue to use Windows 8.

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Community Q&A

To me, backup means another copy that's not on the same computer (i.e. you can't back up your computer without an external hard drive). External hard drives are inexpensive and a really good idea. You just drag and drop into folders you create. Even a one terrabite external is affordable.

My PC was bought with Windows XP on it. Will I have any problem installing Windows 8 on it and do I need to back up my data then reinstall it?

wikiHow Contributor

You're unlikely to have a problem. You may not have the fastest computer, but it should still be usable. You will need to reinstall programs as well as restore files, so definitely do a back up of data.

If you’ve upgraded a PC to Windows 10 — not performed a clean install, but an upgrade — you’ll have an easy option that lets you revert to the last version of Windows. To access this, open the Start menu and select "settings." Click the “Update & Security” icon, then select “Recovery.”

It depends on whether your corrupted system is from a broken OS or broken hardware. Installing Windows 8 on a corrupted system could help to repair your computer, but if the hardware is corrupted, it will likely not work.

1. Get your Windows 8 disk/ISO/USB.
2. Run Setup.exe
3. When choosing what install, you have to choose Custom because Upgrade will not work.
4. Let it install.
Keep in my that you will lose everything when you install Windows 8.

If you’ve upgraded a PC to Windows 10 — not performed a clean install, but an upgrade — you’ll have an easy option that lets you revert to the last version of Windows. To access this, open the Start menu and select Settings. Click the “Update & security” icon and select “Recovery.”